NC0024228_Staff Comments_20050331

NPDES DOCUMENT :;CANNING COVER SHEET
NPDES Permit:
NC0024228
High Point Westside WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
(9_,cr,„,,,„ /5
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
March 31, 2005
This document is printed on reuse paper - ignore any
content on the re -sr -ex -se side

Division of Water Quality
March 31, 2005
MEMORANDUM
To: Susan Wilson
From: Matt Matthews " '4
Subject: Cu & Zn Limit Recommendations
City of High Point-Westside WWTP
NPDES No. NC0024228
Davidson County
By letter dated February 25, 2005 (attached) our office recommended implementation of appropriate Cu
and Zn limits for the subject facility based on the Division's Cu-Zn Action Level Policy and materials
submitted to the Division by the City. Subsequently, the City has submitted further data collected
during the recent period of non-compliance with its WET limit. Based on that submittal (attached) we
recommend that neither Cu nor Zn limits be implemented in the facility's upcoming permit.
October and December 2003 WET test failures initiated DWQ's Copper and Zinc Action Level Policy
requirements. Point Source Branch personnel conducted an evaluation of previous monitoring data of
these parameters that indicated a reasonable potential to violate instream action 1evelsTota1.
Our office received information transmitted by cover letters dated 11/22/04 and 12/13/04 from the City
documenting activities conducted to rule out copper and zinc as causative effluent toxicants. At that
time, our staff saw no evidence conclusively ruling out Cu or Zn as sources of toxicity. As you are
aware, our policy states that in the face of inconclusive TIEs or other activities, the Division will apply
limits. This was recommended in our February 25, 2005 correspondence.
The City has subsequently submitted further data under cover letter dated March 10 2005 (attached).
The submittal consists of a timeline documenting operational data, operational problems, and WET test
results. Based on this submittal we are convinced that the WET failures were indeed due to several
operational problems at the facility that have been corrected. The primary cause of the 'WET failures
appears to be the confluence of a change in sludge handling at the facility with an ongoing (but
unknown at the time) sand filter valve malfunction that allowed an influent surcharge to the sand filter
effluent. Once this surcharge was discovered and terminated in May 2004, WET test failures ceased.
Therefore, we do not recommend implementation of Cu or Zn limits at this time.
Note that the facility remains subject to the Action Level Policy should WET limit violations occur in
the future.
Please call me at [phone] if you have questions.
Attachments
cc: Mr. Terry Houk, City of High Point, PO Box 230, High Point, North Carolina 27261
Steve Tedder/Winston-Salem Regional Office
Marshall Hyatt, US EPA Region IV, Water Mgt. Div., 61 Forsyth St., SW, Atlanta, Georgia 30303
Dawn Jeffries
Kevin Bowden
Central Files
EE@E11WE
5
APR
5 2005
DENR - WATER QUIMTY
POINT SOURCE BRANCH
1
Y
•
Environmental Sciences Section Division of Water Quality

(7Z;s) Michael F. Easley, Governor
4,i William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Mr. Terry Houk
City of High Point
PO Box 230
High Point, North Carolina 27261
SUBJECT:
Dear Mr. Houk:
February 25, 2005
DWQ COPPER AND ZINC ACTION LEVEL POLICY
Whole Effluent Toxicity (WET) Testing
NPDES Permit No. NC0024228
. City of High Point — Westside WWTP
Davidson County
Our office has received information transmitted by cover letters dated 11/22/04 and 12/13/04 from the City documenting actions to rule
out copper and zinc as causative effluent toxicants. DWQ's Copper and Zinc Action Level Policy was triggered by the October and December
2003 WET test failures. An evaluation of reasonable potential to violate instream action levelsT,,,, for these parameters was conducted by the
Point Source Branch and Notices of Violation(s) dated 12/29/03 and 2/23/04 were sent to the facility. The City indicated in correspondence dated
1/27/04 that it would conduct Toxicity Identification Evaluations (TIEs) to rule out copper and zinc as sources of toxicity. Our office recommends
NPDES Permit No. NC0024228 be reopened to include appropriate final permit limitations for copper and zinc.
The City's submittals provide no convincing data indicating that WET test failures were not caused by copper and/or zinc. Our office notes
that no TIE testing with toxic effluent samples was conducted from February 2004 through May 2004. The City's 1/27/04 letter indicates the ability
to perform on -site TIE testing.
Mr. Bill Frazier was contacted on 12/3/04 and 1/10/05 to discuss the City's TIE efforts. The City was informed thatunless additional
information was submitted to support the City's position that copper and zinc were not causative effluent toxicants, then our office would request
copper and zinc limits be placed in the permit. To date, we have not received further formal correspondence from High Point that would support the
City's position that copper and zinc were not causative effluent toxicants. Our office appreciates Mr. Frazier's cooperation in this matter.
Our office has worked with the City to acquire additional information and has been flexible in allowing additional support information to
be submitted for evaluation.
Based on our review of the Citv's TIE efforts and lack of additional support information, we recommend NPDES Permit No. NC0024228
be reopened to include appropriate copper and zinc final NPDES permit limitations.
Please feel free to contact me at [phone] if you have any questions.
Sincerely,
Matt Matthews, Supervisor
Aquatic Toxicology Unit
cc: Steve Tedder/Winston-Salem Regional Office
Dave Goodrich -Point Source Branch
Susan Wilson -Western NPDES Program
Pretreatment Unit
Marshall Hyatt, US EPA Region IV, Water Mgt. Div., 61 Forsyth St., SW, Atlanta, Georgia 30303
Aquatic Toxicology Unit Files
Central Files
NCarolina
aNaturally
North Carolina Division of Water Quality 1621 Mail Service Center Raleigh, NC 27699-1621 Phone [phone] Customer Service
Internet www.esb.enr.state.nc.us 4401 Reedy Creek Rd. Raleigh, NC 27607 FAX [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycled/10% Post Consumer Paper

CITY OF HIGH POINT
NORTH CAROLINA
March 10, 2005
NC Department of Environment and Natural Resources
Division of Water Quality
Environmental Sciences Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
[phone]
RE: Response to Inquiries of Toxicity Failures
City of High Point
Westside Wastewater Plant
NPDES Permit #: NC0024228
Dear Mr. Matthews:
RECEWED
MAR 1 A^ ,
Ernlronrnental Siences P..,_.
The Westside WWTP has experienced failures of the toxicity tests from October 2003
thru May 2004. During the period of non-compliance, the City was aggressively looking
at plant operations, laboratory results and industrial discharges in an effort to identify the
reason(s) for the toxicity failures. Your office has requested that the City provide you
with plant data before, during and after the toxicity issues. This data is compiled in Table
II (attached). The following narrative supports the timeline of events and issues in Table I
(attached).
The City also established a technical group to review the data too see if a positive
identification could be made of the parameter(s) causing the toxicity issues. In addition
to plant compliance data, the group also looked at the total operation of the plant. Several
conclusions were reached concerning the toxicity issues:
o. Prior to the onset of the toxicity issues, there did not seem to be a problem
with maintaining Dissolved Oxygen (DO) in the aeration tanks. Beginning
in April of 2003, it became necessary to use the maximum number of
blowers to maintain DO levels for treatment but biomass appears sheared
due to turbulence. We determined the air supply line for the diffused air
system had multiple underground leaks, limiting the amount of oxygen
available to the aeration system. These underground leaks were difficult
to locate but were eventually identified and repaired by April 29, 2004.
o Prior to the onset of toxicity issues, secondary clarifiers were fully
operational. One or both of the final clarifiers was taken out of service
intermittently for repairs in October 2003, April 2004 and May 2004
reducing treatment efficiency. All repairs were completed by May 2003.
P.O. Box 230, 211 S. HAMILTON STREET. HIGH POINT. NORTH CAROLINA 27261 FAX [phone] TDD 336-883-8517

o Prior to October 2003, the plant utilized lime stabilization of sludge. In
October 2003 they began dewatering sludge by centrifuge. This change
increased the ammonia loading on the plant and decreased the available
alkalinity (see Table II) Lime addition was used as a pH control initially
but proved to provide insufficient alkalinity levels for treatment. When
low alkalinity appears to have enhanced ammonia toxicity in March 2004,
the focus shifted to controlling alkalinity levels. Ammonia levels dropped
and did not seem to be a factor.
o Polymer trials for the dewatering of sludge were being conducted. This
testing could cause excess polymer to be in the treatment process,
increased loading on the plant because of poor capture of solids, etc.
These polymer trials were run in April 2004.
o A valve in the sand filters unknowingly allowed influent to surcharge to
sand filter effluent during peak (> 9 MG) flow events. It was not
recognized as being a possible factor to toxicity failures due to other
treatment issues until several other parameters had been eliminated. Once
identified, the situation was corrected and toxicity events ceased.
Conclusion: The city of High Point believes that the toxicity failures were caused by a
combination of high flows, operational problems and mechanical problems. These items
have been identified and corrected. Since the operational issues have been addressed the
plant has passed the last four toxicity tests. Lab data does not indicate that one specific
parameter caused the toxicity problems and even points away from copper and zinc as
contributors to toxicity.
Thank you,
Terry Houk
William Frazier
Tim Fitzgerald
Dwight Lancaster 9
Cc: Perry Kairis
Steve Tedder, DWQ — WS
Steve Mauney, DWQ — WS
File

Table I
Toxicity Timeline
Jan-02
A•r-02
JuI-02
Oct-02
Jan-03
A•r-03
Jul-03
Oct-03 Nov-03 Dec-03
Jan-04
Feb-04 Mar-04 A•r-04 Ma -04
Jun-04
Jul-04
Oct-04
0
0
Analytical parameters Z
Initial reports of Inhibited feeding
suspected
Photos of inhibited feeding
Excessive
flow
Excessive
flow
Excessive flow
Difficulty filtering TSS but cannot
track due to incorrect technique
Technique corrected. Easily tracked. Difficulty in filtering. Up to 10 fold decrease in volume
filterable common
Excessive
NH3-N
Alkalinity
low.
alkalinity
low. 2nd
sample -
barely
passed.
Alkalinity
low
Alkalinity
low
Alkalinity
seems OK.
NH3-N
suspect
due to very
low Alk
Excessive
NH3-N
IPP parameters
Excessive
INF BOD -
apparently
an IPP
issue
generally increasing trend of pretreated chemical waste - decreasing trend of dairy waste.
Treatment parameters WE
i ,.)
a
cr..
=
Stopped lime stabilization of raw sludge removed from plant. Decant fom process had added some alkalinity to treatment train now
unavailable. Trend develops of high NH3-N on first few days of week. Intermittent issues with lime addition due to equipment. Initial
cure unknown. Solution found in low alkalinity. Lime slakers replaced end of March, 2004. Lime addition pre -aeration is solution.
Equipment is still being fine tuned.
0
cO
G
Aeration is suspect due to difficulty in maintaining DO in aeration w/o multiple pumps - eventually, leaks were
found inaccessibly underground and fixed April 29, 2004
Telespcpic dr-u: valve surcharging from influent to sand filter effluent channel during high flow. Was not a known or design condition and only occurred when influent
flow maximu => ceeed 9 MG.
CC
E
a
•"'
Surcharge
confirmed -
telescopic
valve
capped to
filters May
21, 2004
Polymer
effectivene
s
demonsstr
ations for
sludge
dewatering
Weather &
centrate
issues
Secondari
es are out
of service
intermittent
Iv
Secondaries are out of
service intermittently

Table 11
Data Evaluation
Date
TOX
off
Int
4091FI�
EH
Flow
Int pH EH pH
Inf BOD
EH
BOD
o
a
s
w
NH3.N
Inf TSS
EH
TSS
ami
filtered
0mi
Olo'md
tiff COD
Eff
COD
Eff Cu
Eff Zn
10/4(04
3.94
7.10 0.00
414
2
70.0
31.0
0424
169
6
17
1000
445
77.4
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4.25
8.90 8.40
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4
135.0
94.0
0.642
260
4
10
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679
75.5
8.383
38
10/8/04
---
9
3.84
7.23 0.81
395
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140.0
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0.432
320
6
10
1000
857
03.3
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3.84
7.06 6.50
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Lower Wam Limit•
2.45
0.61
8.27
-16
-2
-1.188
01
-6
2
94
237
40.0
,..

Action Level Calculation 03/14/05
Metal Chronic AL Acute AL 1/2 FAV Chronic CF Acute CF Kpo alpha WQCdis(chrnc) WQCdis(ac)
Copper 7 7.3 0.96 0.96 1.04E+06-0.7436 6.72 7.008
Zinc 50 67 0.986 0.978 1.25E+06-0.7038 49.3 65.526
Facility
Permit No. Flow 7Q10s IWC Subbasin TSS(15th ptci Cu fD=cD/cT Zn fD=cD/cT Cu C instrm Zn C instrm
High Point-Westside NC0024228 6.2 0.67 93.48 YAD07 4 4.03E-01 3.47E-01 17 142
Facility Permit No. Cu Limit Zn Limit (If blank, no RP to exceed the recalculated Action Level)
High Point-Westside NC0024228 18.2 erg/I N/A
NOTES: Facility shows no RP for zinc; but does show RP for copper. Recommend weekly average limit of 18.2 pug/l for Cu.

Action Level Calculation 03/14/05
Metal Chronic AL
Copper 7
Zinc 50
Facility Permit No. Cu Ac Ins Zn Ac Inst
High Point-Westside NC0024228 17 189
Facility Permit No.
High Point-Westside NC0024228
NOTES: Facility shows n{

Facility Name =
NPDES # =
Qw (MGD) =
7QIOs (cfs)=
IWC (%) =
High Point Westside WWTP
NC0024228
6.2
0.67
93.47
FINAL RESULTS
Copper
Max. Pred Cw
Allowable Cw
Acute Value
306.0
18.2
ug/1
ug/1
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw (Chronic)
Allowable Cw (Acute)
15.0117
9.2
1.6361
111
1.95
156.6 leg/1
306.0 leg/1
18.2 pg/1
17.0 µgll
Entered by Dawn Jeffries
Parameter =
Standard =
Date n < Actual Data
Jan-03 1 5.0
2 11.3
3 6.0
4 9.3
5 7.5
6 11.3
7 8.7
8 13.2
9 9.9
10 8.5
11 6.5
12 6.1
13 5.0
14 5.6
15 8.0
16 5.0
17 5.2
18 5.0
19 5.5
20 5.0
21 5.9
22 6.1
23 10.7
24 8.3
25 10.1
26 6.2
27 5.9
28 7.2
29 8.1
30 8.7
31 9.9
32 8.2
33 7.4
34 8.2
35 8.1
36 7.8
37 8.3
38 8.6
39 5.0
40 5.0
41 5.0
42 8.7
43 6.4
44 8.7
45 11.1
46 9.8
47 9.6
48 9.2
49 7.3
50 5.0
51 5.7
52 6.8
53 5.3
54 7.3
Jan-04 55 7.0
56 9.3
57 13.6
58 11.1
59 26.3
60 19.9
Copper
BDL=1/2DL
2.5
11.3
6.0
9.3
7.5
11.3
8.7
13.2
9.9
8.5
6.5
6.1
lesst 2.5
5.6
8.0
lesst 2.5
5.2
lesst 2.5
5.5
lesst 2.5
5.9
6.1
10.7
8.3
10.1
6.2
5.9
7.2
8.1
8.7
9.9
8.2
7.4
8.2
8.1
7.8
8.3
8.6
lesst 2.5
lesst 2.5
lesst 2.5
8.7
6.4
8.7
11.1
9.8
9.6
9.2
7.3
lesst 2.5
5.7
6.8
5.3
7.3
7.0
9.3
13.6
11.1
26.3
19.9
lesst
Page 1

61 17.8 17.8
62 6.4 6.4
63 9.7 9.7
64 12.3 12.3
65 9.2 9.2
66 8.6 8.6
67 6.4 6.4
68 5.7 5.7
69 6.7 6.7
70 5.9 5.9
71 9.4 9.4
72 6.5 6.5
73 6.6 6.6
74 5.0 5.0
75 5.0 lesst 2.5
76 6.7 6.7
77 6.5 6.5
78 6.1 6.1
79 7.6 7.6
80 11.0 11.0
81 14.5 14.5
82 5.0 lesst 2.5
83 5.0 lesst 2.5
84 5.0 lesst 2.5
85 5.0 lesst 2.5
86 5.0 lesst 2.5
87 5.0 lesst 2.5
88 5.5 5.5
89 5.0 lesst 2.5
90 5.0 lesst 2.5
91 5.1 5.1
92 9.5 9.5
93 8.9 8.9
94 7.4 7.4
95 6.4 6.4
96 5.0 lesst 2.5
97 7.8 7.8
98 7.7 7.7
99 7.7 7.7
100 7.1 7.1
101 156.6 156.6
102 9.4 9.4
103 21.3 21.3
104 29.7 29.7
105 14.7 14.7
106 5.2 5.2
107 8.6 8.6
Jan-05 108 7.0 7.0
109 9.0 9.0
110 12.0 12.0
111 9.0 9.0
Page 2

Facility Name =
NPDES # =
Qw (MGD) =
7QIOs (cfs)=
1WC (%) =
High Point Westside WWTP
NC0024228
6.2
0.67
93.47
FINAL RESULTS
Zinc
Max. Pred Cw
Allowable Cw
141.6 ug/1
151.9 ug/1
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw (Chronic)
Allowable Cw (Acute)
18.7385
46.9
0.3996
111
1.25
113.0 µg/l
141.6 µg/1
151.9 µg/1
189.0 µg/1
Entered by D. Jeffries
Parameter =
Standard =
Date n < Actual Data
Jan-03 1 52.0
2 50.0
3 76.0
4 51.0
5 57.0
6 58.0
7 49.0
8 82.0
9 96.0
10 59.0
11 50.0
12 41.0
13 27.0
14 26.0
15 30.0
16 31.0
17 25.0
18 27.0
19 25.0
20 49.0
21 40.0
22 28.0
23 25.0
24 32.0
25 35.0
26 44.0
27 39.0
28 49.0
29 53.0
30 57.0
31 54.0
32 41.0
33 50.0
34 32.0
35 25.0
36 25.0
37 55.0
38 58.0
39 38.0
40 40.0
41 50.0
42 44.0
43 35.0
44 48.0
45 42.0
46 51.0
47 44.0
48 55.0
49 78.0
50 103.0
51 113.0
52 67.0
53 46.0
54 46.0
Jan-04 55 46.0
56 66.0
57 71.0
58 50.0
59 45.0
60 45.0
61 39.0
Zinc
lesst
tie
BDL=1/2DL
52.0
50.0
76.0
51.0
57.0
58.0
49.0
82.0
96.0
59.0
50.0
41.0
27.0
26.0
30.0
31.0
25.0
27.0
12.5
49.0
40.0
28.0
25.0
32.0
35.0
44.0
39.0
49.0
53.0
57.0
54.0
41.0
50.0
32.0
25.0
25.0
55.0
58.0
38.0
40.0
50.0
44.0
35.0
48.0
42.0
51.0
44.0
55.0
78.0
103.0
113.0
67.0
46.0
46.0
46.0
66.0
71.0
50.0
45.0
45.0
39.0
Page 1

62 45.0 45.0
63 36.0 36.0
64 25.0 lesst 12.5
65 32.0 32.0
66 31.0 31.0
67 38.0 38.0
68 42.0 42.0
69 43.0 43.0
70 32.0 32.0
71 32.0 32.0
72 25.0 lesst 12.5
73 35.0 35.0
74 25.0 25.0
75 34.0 34.0
76 36.0 36.0
77 35.0 35.0
78 62.0 62.0
79 35.0 35.0
80 44.0 44.0
81 25.0 lesst 12.5
82 25.0 lesst 12.5
83 25.0 lesst 12.5
84 50.0 50.0
85 48.0 48.0
86 31.0 31.0
87 52.0 52.0
88 60.0 60.0
89 42.0 42.0
90 32.0 32.0
91 42.0 42.0
92 42.0 42.0
93 34.0 34.0
94 58.0 58.0
95 36.0 36.0
96 33.0 33.0
97 52.0 52.0
98 32.0 32.0
99 41.0 41.0
100 36.0 36.0
101 34.0 34.0
102 29.0 29.0
103 31.0 31.0
104 26.0 26.0
105 25.0 lesst 12.5
106 41.0 41.0
107 51.0 51.0
Jan-05 108 47.0 47.0
109 49.0 49.0
110 57.0 57.0
111 64.0 64.0
Page 2

CERTIFIED MAIL h P. u) eo7
RETURN RECEIPT REQUESTED
Mr. Terry Houk
City of High Point
PO Box 230
High Point, North Carolina 27261
SUBJECT:
Dear Mr. Houk:
DWQ
Whole
NPDE
City of
Davids
Our office has received info
out copper and zinc as causative efflu
2003 WET test failures. An evaluatio
Point Source Branch and Notices of V
1/27/04 that it would conduct Toxicity
NPDES Permit No. NC0024228 be re
The City's submittals provid
that no TIE testing with toxic effluent
to perform on -site TIE testing.
Mr. Bill Frazier was contacte
information was submitted to support t
copper and zinc limits be placed in the
City's position that copper and zinc we
Our office has worked with t
be submitted for evaluation.
U
Michael F. Easley, Governor
William G. Ross Jr., Secretary
f Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
I :
• 1— ocumenting actions to rule
October and December
was conducted by the
ed in correspondence dated
ty. Our office recommends
and/or zinc. Our office notes
04 letter indicates the ability
d that unless additional
our office would request
Point that would support the
on in this matter.
nal support information to
Based on our review of the Citv's TIE efforts and lack of additional support information we recommend NPDES Permit No. NC0024228
be reopened to include appropriate copper and zinc final NPDES permit limitations. 1 . 0677-
b�
� r�
61k" celr lA1
t\-r°•it.'
3- 0 to ba cv 0 t 0l (
0"A Qvi ',Ai i
te
1Jr..
Please feel free to contact me at [phone] if you have any questions.
Sincerely,
Matt Matthews, Supervisor
Aquatic Toxicology Unit
cc: Steve Tedder/Winston-Salem Regional Office
Dave Goodrich -Point Source Branch
Susan Wilson -Western NPDES Program
Pretreatment Unit
Marshall Hyatt, US EPA Region IV, Water Mgt. Div., 61 Forsyth St., SW, Atlanta, Georgia 30303
Aquatic Toxicology Unit Files
Central Files
N_ 0o hCarolina
,Naturally
North Carolina Division of Water Quality 1621 Mail Service Center
Internet: www.esb.enr.state.nc.us 4401 Reedy Creek Rd.
Raleigh, NC 27699-1621
Raleigh, NC 27607
An Equal OpportunitylAffinnative Action Employer — 50% Recycled110°% Post Consumer Paper
Phone [phone] Customer Service
FAX [phone]

CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Mr. Terry Houk
City of High Point
PO Box 230
High Point, North Carolina 27261
SUBJECT:
Dear Mr. Houk:
February 25, 2005
DWQ COPPER AND ZINC ACTION LEVEL POLICY
Whole Effluent Toxicity (WET) Testing
NPDES Permit No. NC0024228
City of High Point — Westside WWTP
Davidson County
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Our office has received information transmitted by cover letters dated 11/22/04 and 12/13/04 from the City documenting actions to rule
out copper and zinc as causative effluent toxicants. DWQ's Copper and Zinc Action Level Policy was triggered by the October and December
2003 WET test failures. An evaluation of reasonable potential to violate instream action levels -row for these parameters was conducted by the
Point Source Branch and Notices of Violation(s) dated 12/29/03 and 2/23/04 were sent to the facility. The City indicated in correspondence dated
1/27/04 that it would conduct Toxicity Identification Evaluations (TIEs) to rule out copper and zinc as sources of toxicity. Our office recommends
NPDES Permit No. NC0024228 be reopened to include appropriate final permit limitations for copper and zinc.
The City's submittals provide no convincing data indicating that WET test failures were not caused by copper and/or zinc. Our office notes
that no TIE testing with toxic effluent samples was conducted from February 2004 through May 2004. The City's 1/27/04 letter indicates the ability
to perform on -site TIE testing.
Mr. Bill Frazier was contacted on 12/3/04 and 1/10/05 to discuss the City's TIE efforts. The City was informed that unless additional
information was submitted to support the City's position that copper and zinc were not causative effluent toxicants, then our office would request
copper and zinc limits be placed in the permit. To date, we have not received further formal correspondence from High Point that would support the
City's position that copper and zinc were not causative effluent toxicants. Our office appreciates Mr. Frazier's cooperation in this matter.
Our office has worked with the City to acquire additional information and has been flexible in allowing additional support information to
be submitted for evaluation.
Based on our review of the City's TIE efforts and lack of additional support information, we recommend NPDES Permit No. NC0024228
be reopened to include appropriate copper and zinc final NPDES permit limitations.
Please feel free to contact me at [phone] if you have any questions.
Sincerely,
Matt Matthews, Supervisor
Aquatic Toxicology Unit
cc: Steve Tedder/Winston-Salem Regional Office
Dave Goodrich -Point Source Branch
Susan Wilson -Western NPDES Program
Pretreatment Unit
Marshall Hyatt, US EPA Region IV, Water Mgt. Div., 61 Forsyth St., SW, Atlanta, Georgia 30303
Aquatic Toxicology Unit Files
Central Files
None Carolina
Vatureff
North Carolina Division of Water Quality 1621 Mail Service Center Raleigh, NC 27699-1621 Phone [phone] Customer Service
Internet www.esb.enr.state.nc.us 4401 Reedy Creek Rd. Raleigh, NC 27607 FAX [phone]
An Equal Opportunity/Affirmative Action Employer — 50% Recycled/10% Post Consumer Paper